<template>
<div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>数据统计</el-breadcrumb-item>
        <el-breadcrumb-item>数据报表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 2. 为ECharts准备一个具备大小（宽高）的Dom -->
        <div id="main" style="width: 750px;height:400px;"></div>
    </el-card>
</div>
</template>

<script>
// 1. 导入 echarts
import echarts from 'echarts'
import _ from 'lodash'

export default {
    data() {
        return {
            // 需要合并的数据
            options: {
                title: {
                    text: '用户来源'
                },
                tooltip: {
                    trigger: 'axis',
                    axisPointer: {
                        type: 'cross',
                        label: {
                            backgroundColor: '#E9EEF3'
                        }
                    }
                },
                grid: {
                    left: '3%',
                    right: '4%',
                    bottom: '3%',
                    containLabel: true
                },
                xAxis: [{
                    boundaryGap: false
                }],
                yAxis: [{
                    type: 'value'
                }]
            }
        }
    },
    created() {},
    // 此时，页面上的元素，已经被渲染完毕了！
    async mounted() {
        // 3. 基于准备好的dom，初始化echarts实例
        var myChart = echarts.init(document.getElementById('main'))

        const {
            data: res
        } = await this.$http.get('reports/type/1')
        if (res.meta.status !== 200) {
            return this.$message.error('获取折线图数据失败！')
        }

        // 4. 准备数据和配置项
        const result = _.merge(res.data, this.options)
        // console.log(result)

        // 5. 展示数据
        myChart.setOption(result)
    },
    methods: {}
}
</script>

<style lang="less" scoped>
</style>
